How to send a message to the iPhone, knowing the active AppleID there?

Question

iOS

For some time, a friend had an iPhone, acc to my mail. Then he sold it, but apparently did not log out. As a result, I know the login and password before icloud, but there is a two-stage. But I just want that person to untie my acc and make his own. Is it possible to do this without pressing the "ahh my phone was stolen" button?

Answer 1

imessage?